This documentation is archived and is not being maintained.

DnsPermission::IsSubsetOf Method

Determines whether the current permission instance is a subset of the specified permission instance.

Namespace:  System.Net
Assembly:  System (in System.dll)

virtual bool IsSubsetOf(
	IPermission^ target
) override


Type: System.Security::IPermission
The second DnsPermission instance to be tested for the subset relationship.

Return Value

Type: System::Boolean
false if the current instance is unrestricted and target is either nullptr or unrestricted; otherwise, true.




target is neither a DnsPermission nor nullptr.

The current DnsPermission instance is a subset of the specified DnsPermission instance if the current DnsPermission instance specifies a set of operations that is wholly contained by the specified DnsPermission instance.

If the IsSubsetOf method returns true, the current DnsPermission instance allows no more access to DNS servers than does the specified DnsPermission instance.

The following example uses the IsSubsetOf method to determine whether the current permission instance is a subset of the specified permission instance.

   void useDns()
      // Create a DnsPermission instance.
      permission = gcnew DnsPermission( PermissionState::Unrestricted );
      DnsPermission^ dnsPermission1 = gcnew DnsPermission( PermissionState::None );
      // Check for permission.
      // Print the attributes and values.
      Console::WriteLine( "Attributes and Values of 'DnsPermission' instance :" );
      PrintKeysAndValues( permission->ToXml()->Attributes );
      Console::WriteLine( "Attributes and Values of specified 'DnsPermission' instance :" );
      PrintKeysAndValues( dnsPermission1->ToXml()->Attributes );
      Subset( dnsPermission1 );

   void Subset( DnsPermission^ Permission1 )
      if ( permission->IsSubsetOf( Permission1 ) )
         Console::WriteLine( "Current 'DnsPermission' instance is a subset of specified 'DnsPermission' instance." );
         Console::WriteLine( "Current 'DnsPermission' instance is not a subset of specified 'DnsPermission' instance." );

   void PrintKeysAndValues( Hashtable^ myList )
      // Get the enumerator that can iterate through the hash table.
      IDictionaryEnumerator^ myEnumerator = myList->GetEnumerator();
      Console::WriteLine( "\t-KEY-\t-VALUE-" );
      while ( myEnumerator->MoveNext() )
         Console::WriteLine( "\t {0}:\t {1}", myEnumerator->Key, myEnumerator->Value );

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.